There's a question you see that you know is good and deserves to be answered, but has not been so yet. Furthermore, the most that has happened on it is some people commenting. People haven't voted to close it, there are no votes for it; really, nothing has happened on it. Is there a way to bring it back to the attention of the MSE without offering bounty? Perhaps re-asking it?
There aren't really any good ways to do this outside of placing a bounty. Indeed, the bounty is here exactly to fill this need of drawing more attention to questions that haven't received enough. Even placing a bounty of 50 reputation is likely to bring considerably more attention to the question.
One other thing you might be able to do is to look over the question and make sure it's well-written and generally of good quality. Making it very clear is more likely to attract an answer. This is especially true if you've received any feedback in comments regarding this.
Definitely don't re-ask a question. The platform really doesn't work in a way that would support it - it would likely be closed as a duplicate (and if it weren't, it should be closed as a duplicate).
If you are wondering about this question, just have some patience. You asked it yesterday.
I put a +50 bounty on the question you linked in your question, since it is quite interesting. Hopefully this will also shed some light on your question
The difficulty with your question is that it is based on a false permisse, namely that you can take inverses of an unknown function which is not true in general.